Metadata.php

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<?php

namespace Elgg\Database;

use Doctrine\DBAL\Query\Expression\CompositeExpression;
use Elgg\Database\Clauses\AnnotationWhereClause;
use Elgg\Database\Clauses\EntityWhereClause;
use Elgg\Database\Clauses\MetadataWhereClause;
use Elgg\Database\Clauses\RelationshipWhereClause;
use Elgg\Exceptions\DomainException;
use Elgg\Exceptions\InvalidArgumentException;
use Elgg\Exceptions\LogicException;

class Metadata extends Repository {

    public function count() {
        $qb = Select::fromTable('metadata', 'n_table');

        $count_expr = $this->options->distinct ? 'DISTINCT n_table.id' : '*';
        $qb->select("COUNT({$count_expr}) AS total");

        $qb = $this->buildQuery($qb);

        $result = _elgg_services()->db->getDataRow($qb);

        if (empty($result)) {
            return 0;
        }

        return (int) $result->total;
    }

    public function calculate($function, $property, $property_type = null) {
        if (!in_array(strtolower($function), QueryBuilder::CALCULATIONS)) {
            throw new DomainException("'{$function}' is not a valid numeric function");
        }

        if (!isset($property_type)) {
            $property_type = 'metadata';
        }

        $qb = Select::fromTable('metadata', 'n_table');

        switch ($property_type) {
            case 'attribute':
                if (!in_array($property, \ElggEntity::PRIMARY_ATTR_NAMES)) {
                    throw new DomainException("'{$property}' is not a valid attribute");
                }

                $alias = $qb->joinEntitiesTable('n_table', 'entity_guid', 'inner', 'e');
                $qb->addSelect("{$function}({$alias}.{$property}) AS calculation");
                break;

            case 'metadata':
                $alias = 'n_table';
                if (!empty($this->options->metadata_name_value_pairs) && $this->options->metadata_name_value_pairs[0]->names != $property) {
                    $alias = $qb->joinMetadataTable('n_table', 'entity_guid', $property);
                }
                
                $qb->addSelect("{$function}($alias.value) AS calculation");
                break;

            case 'annotation':
                $alias = $qb->joinAnnotationTable('n_table', 'entity_guid', $property);
                $qb->addSelect("{$function}({$alias}.value) AS calculation");
                break;
        }

        $qb = $this->buildQuery($qb);

        $result = _elgg_services()->db->getDataRow($qb);

        return $result ? (int) $result->calculation : 0;
    }

    public function get($limit = null, $offset = null, $callback = null) {
        $qb = Select::fromTable('metadata', 'n_table');

        $distinct = $this->options->distinct ? 'DISTINCT' : '';
        $qb->select("{$distinct} n_table.*");

        $this->expandInto($qb, 'n_table');

        $qb = $this->buildQuery($qb);

        // Keeping things backwards compatible
        $original_order = elgg_extract('order_by', $this->options->__original_options);
        if (empty($original_order) && $original_order !== false) {
            $qb->addOrderBy('n_table.time_created', 'asc');
            $qb->addOrderBy('n_table.id', 'asc');
        }

        if ($limit > 0) {
            $qb->setMaxResults((int) $limit);
            $qb->setFirstResult((int) $offset);
        }

        $callback = $callback ?: $this->options->callback;
        if (!isset($callback)) {
            $callback = function ($row) {
                return new \ElggMetadata($row);
            };
        }

        return _elgg_services()->db->getData($qb, $callback);
    }

    public function execute() {
        if ($this->options->annotation_calculation) {
            $clauses = $this->options->annotation_name_value_pairs;
            if (count($clauses) > 1 && $this->options->annotation_name_value_pairs_operator !== 'OR') {
                throw new LogicException('Annotation calculation can not be performed on multiple annotation name value pairs merged with AND');
            }

            $clause = array_shift($clauses);

            return $this->calculate($this->options->annotation_calculation, $clause->names, 'annotation');
        } else if ($this->options->metadata_calculation) {
            $clauses = $this->options->metadata_name_value_pairs;
            if (count($clauses) > 1 && $this->options->metadata_name_value_pairs_operator !== 'OR') {
                throw new LogicException('Metadata calculation can not be performed on multiple metadata name value pairs merged with AND');
            }

            $clause = array_shift($clauses);

            return $this->calculate($this->options->metadata_calculation, $clause->names, 'metadata');
        } else if ($this->options->count) {
            return $this->count();
        } else if ($this->options->batch) {
            return $this->batch($this->options->limit, $this->options->offset, $this->options->callback);
        } else {
            return $this->get($this->options->limit, $this->options->offset, $this->options->callback);
        }
    }

    protected function buildQuery(QueryBuilder $qb) {
        $ands = [];

        foreach ($this->options->joins as $join) {
            $join->prepare($qb, 'n_table');
        }

        foreach ($this->options->wheres as $where) {
            $ands[] = $where->prepare($qb, 'n_table');
        }

        $ands[] = $this->buildPairedMetadataClause($qb, $this->options->metadata_name_value_pairs, $this->options->metadata_name_value_pairs_operator);
        $ands[] = $this->buildEntityWhereClause($qb);
        $ands[] = $this->buildPairedMetadataClause($qb, $this->options->search_name_value_pairs, 'OR');
        $ands[] = $this->buildPairedAnnotationClause($qb, $this->options->annotation_name_value_pairs, $this->options->annotation_name_value_pairs_operator);
        $ands[] = $this->buildPairedRelationshipClause($qb, $this->options->relationship_pairs);

        $ands = $qb->merge($ands);

        if (!empty($ands)) {
            $qb->andWhere($ands);
        }

        return $qb;
    }

    protected function buildEntityWhereClause(QueryBuilder $qb) {
        // Even if all of these properties are empty, we want to add this clause regardless,
        // to ensure that entity access clauses are appended to the query
        $joined_alias = $qb->joinEntitiesTable('n_table', 'entity_guid', 'inner', 'e');
        return EntityWhereClause::factory($this->options)->prepare($qb, $joined_alias);
    }

    protected function buildPairedMetadataClause(QueryBuilder $qb, $clauses, $boolean = 'AND') {
        $parts = [];

        foreach ($clauses as $clause) {
            $parts[] = $clause->prepare($qb, 'n_table');
        }

        return $qb->merge($parts, $boolean);
    }

    protected function buildPairedAnnotationClause(QueryBuilder $qb, $clauses, $boolean = 'AND') {
        $parts = [];

        foreach ($clauses as $clause) {
            if (strtoupper($boolean) === 'OR' || count($clauses) > 1) {
                $joined_alias = $qb->joinAnnotationTable('n_table', 'entity_guid');
            } else {
                $joined_alias = $qb->joinAnnotationTable('n_table', 'entity_guid', $clause->names);
            }
            
            $parts[] = $clause->prepare($qb, $joined_alias);
        }

        return $qb->merge($parts, $boolean);
    }

    protected function buildPairedRelationshipClause(QueryBuilder $qb, $clauses, $boolean = 'AND') {
        $parts = [];

        foreach ($clauses as $clause) {
            if (strtoupper($boolean) == 'OR' || count($clauses) > 1) {
                $joined_alias = $qb->joinRelationshipTable('n_table', 'entity_guid', null, $clause->inverse);
            } else {
                $joined_alias = $qb->joinRelationshipTable('n_table', 'entity_guid', $clause->names, $clause->inverse);
            }
            
            $parts[] = $clause->prepare($qb, $joined_alias);
        }

        return $qb->merge($parts, $boolean);
    }
}